From: Brian Candler <b.candler@...>
Date: 2009-03-04T17:59:06+09:00
Subject: Re: fixnum problem plz help

Pascal J. Bourguignon wrote:
> In more strongly typed programming languages such as Common Lisp,
> you'd get an error:
> 
> C/USER[929]> (* "2" 365)
> 
> *** - *: "2" is not a number

This is nothing to do with "strongly typed". Ruby's concept of the 
difference between a string and an integer is just as strict as LISP's.

Rather, Ruby provides semantics to the '*' operator/function for strings 
which LISP doesn't.

You can get exactly the behaviour you desire by _removing_ some Ruby 
functionality.

irb(main):001:0> String.class_eval { undef_method(:*) }
=> String
irb(main):002:0> "2" * 365
NoMethodError: undefined method `*' for "2":String
  from (irb):2
  from :0
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